Multiple band variable multivibrator



V. S. BORSATTINO ETAL MULTIPLE BAND VARIABLE MULTIVIBRATOR Filed Sept. 15, 1965 3 E mm JM Y? F om wmgmm v6? qmm 1 Fill I. ||||||||L lNVE/VTORS. VINCENT 5. BORSATT/NO, CHURSEL E. MARKER and JESSE W. SHALLA B Nov. 15, 1966 A f rarney United States Patent 3,286,197 MULTIPLE BAND VARIABLE MULTIVIBRATOR Vincent S. Borsattino, 4627 Lincoln St.; Chursel E. Marker, 793 Indiana St.; Jesse W. Shalla, 2424 W. 57th Place, all of Gary, Ind.

Filed Sept. 15, 1965, Ser. No. 487,545 2 Claims. (Cl. 331-113) This application which is a continuation-in-part of our co-pending application Serial No. 341,938, filed February 3, 1964, now abandoned, relates to a multiple band variable frequency oscillator of the resistor capacitor type and more particularly to such an oscillator which can be used with a carrier control system such as shown in our co-pending application Serial No. 337,037, filed January 10, 1964. As disclosed in our copending application we utilize a variable frequency multi-vibrator for each motor that is to be controlled. While this disclosed arrangement is satisfactory it is relatively expensive.

It is therefore an object of our invention to provide a multiple band variable frequency oscillator which can take the place of several variable frequency multi-vibrators at less cost.

Another object is to provide such an oscillator which will generate signals having several ranges of frequencies that differ greatly and which can vary the frequency of each signal within its relativelynarrow range.

These and other objects will be more apparent after referring to the following specification and attached drawing, in which:

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58 is connected in series with contacts C2 and 20C3 when these contacts are in their broken line position. Variable resistors 60 and 62 are connected in series with each other and in parallel with capacitor 58. Arms 54A and 60A of resistors 54 and 60 are mechanically interconnected so that the eifective value of resistor 54 will always be the same as that of resistor 60. Arms 56A and 62A of resistors 56 and 62 are mechanically interconnected so that the effective value of resistor 56 will always be the same as that of resistor 62. A capacitor 64 is connected in series with contacts 34C and 3401 when in the broken line position. Variable resistors 66 and 68 are connected in series with each other and in parallel with capacitor 64. A capacitor 70 is connected in series with contacts 34C2 and 34C3 when these contacts are in their broken line position. Variable resistors 72. Arms 68A and 74A are mechanically inter-connected so that the eifective value of resistor 68 will always be the same as that of resistor 74. A capacitor 76 is connected in series with contacts 50C and 50C1 when in the broken line position. Variable resistors 78 and 80 i are connected in series with each other and in parallel The single figure is a schematic view of the generator of our invention.

, Referring more particularly to the drawing, reference numeral 2 indicates a battery or other low voltage power source. The positive terminal of the battery 2 is connected to emitters 4E and 6E of transistors 4 and 6 which are Type '2N1404 or equivalent. Collectors 4C and 6C are connected to the negative terminal of power source 2 through resistors 8 and 10, respectively. The resistor 8 has a slightly lower value than resistor 10 because signal output connection 11 is taken off collector 6C. Base 4B is connected to the positive terminal of battery 2 through current limiting resistor 12 and biasing resistor 14. Base 6B is connected to the positive terminal of battery 2 through resistor 12 and biasing resistor 16. A lead 18 connects the collector 6C to contact 20C of multiple contact switch 20. Alead 22 connects base 4B through biasing resistor 24 to contact 20C1 of switch 20. A lead 26 connects base 6B through biasing resistor 28 to contact 20C2 of switch 20. A lead 30 connects collector 4C to contact 20C3 of switch 20 I The contacts 20C, 20C1, 20C2 an-d 20C3 are normally in the full line position shown, but may be moved to the broken line position. When in the full line position contact 20C is connected by lead 32 to contact 34C of multiple contact switch 34. When in full line position contacts 20C1, 20C2 and 20C3 are connected by means of leads 36, 38 and 40, respectively, to contacts 34C1, 34C2 and 34C3 of switch 34. Contacts 34C, 34C1, 34C2 and 34C3 are normally in the full line position shown but may be moved to their broken line position. When in full line position the contacts 340, 34C1, 34C2 and 34C3 are connected by leads 42, 44, 46 and 48, respectively, to contacts 50C, 50C1, 50C2 and 50C3 of multiple contact switch 50. The contacts 50C, 50C1, 50C2 and 50C3 are normally open as shown in full lines but may be moved to the broken line position shown.

A capacitor 52 is connected in series with contacts 20C and 20C1 when in the broken line position. Variable resistors 54 and 56 are connected in series with each other and in parallel with capacitor 52. A capacitor with capacitor 76. A capacitor 82 is connected in series with contacts 50C2 and 50C3 when these contacts are in their broken line position. Variable resistors 84 and 86 are connected in series with each other and in parallel with capacitor 82. Arms 78A and 84A are mechanically inter-connected so that the effective value of resistor 78 will always be the same as that of resistor 84. Arms A and 86A are mechanically inter-connected so that the effective value of resistor 80 will always be the'same as that of resistor 86.

The value of resistors 14 and 24 are the same as the values of resistors 16 and 28, respectively. The values of elements 52, 54 and 56 are the same as the values of elements 58, 60 and 62, respectively. The values of elements 64, 66 and 68 are the same as the values of elements 70, 72 and 74, respectively. The values of elements 76, 78 and 80 are the same as the values of elements 82, 84 and 86, respectively. However, the values of capacitors 52, 64 and 76 preferably differ from one another and the values of the resistors connected in parallel with these capacitors also preferably differ from the values of the resistors connected in parallel with the other capacitors. In any event the values of the circuits including the capacitors and related resistors must differ one from another. I

In operation, assuming that it is desired to obtain an output signal having a frequency within a range determined by the values of elements 52, 54, 56, 58, 60 and 62, the contacts of switch 20 are move-d to their broken line position. This frequency may be changed within the range by changing the position of arms 56A and 62A in the same manner as in our co-pending application. With the contacts of switch 20 in the broken line position, the collector 6C is connected through line 18, switch 20C, capacitor 52 and resistors 54 and 56, switch 20C1 and line 22 to base 4B. Also collector 4C is connected through line 30, switch 20C3, capacitor 58 and resistors 60 and 62, switch 20C2 and line 26 to base 6B. Thus the desired signal is obtained at output line 11 in a manner similar to other multivibrators. When it is desired to obtain an output signal having a frequency within a range determined by the values of elements 64, 66, 68, 70, 72 and 74, switch 20 is actuated to move its contacts to the solid line position shown and switch 34 is actuated to move its contacts to the broken line posithis rangeby moving-the position of arms 68A and 74A in the same manner as inour co-pending application. When it is desired to obtain an output signal having a frequency having a range determined by the values of elements 76, 78, 80, 82, 84 and 86, switches 20 and 34 are positioned With their contacts in the full line position shown and switch 50 is positioned with its contacts in the broken line position. This frequency may be varied by changing the position of arms 80A and 86A. The purpose of the resistors-54, 60, 66, 72, 78 and 84 is to enable compensation to be made for any shift in frequency due to aging of the parts. It will be understood that additional signals having still different frequencies may be obtained by the use of additional multiple contact switches and additional capacitors and variable resistors associated with the switch. The values of these additional capacitors and resistors would, of course, vary from the values of the capacitors and resistors of the other units. The selective connections between the transistors 4 and 6 to the capacitors and resistors of the various units will be apparent.

While one embodiment of our invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.

We claim:

-1. A multiple band variable frequency oscillator comprising a first unit including a pair of like transistors each having a base, a collector and an emitter, a DC. power source, means connecting one side of said power source to each of said emitters, a connection between the other side of said power source and one of said collectors, a resistor in said connection, a connection between the said other side of said power source and the other of said collectors, a resistor in said last named connection, a' connection between the said one side of said power source and one of said bases, a resistor in said last named connection, a oonnectioin between the said one side of said power source and the other of said bases, and a resistor in said last named connection; a second unit; a third unit; each of said second and third units having a first capacitor connected in parallel with a first variable resistor, a second capacitor connected in parallel with a second variable resistor, the values of the first and second capacitors being equal to one another, and means for varying the effective value of the first and second variable resistors so that the effective value of the first variable resistor will be the same as the effective value of thesecond variable resistor, the values of the variable resis tors and capacitors of the second unit differing substantially from the values of the variable resistors and capacitors of the third unit; and means for selectively connecting the collector'of one of said transistors to the base of the other transistor through the first capacitor and first variable resistor of the second and third units and selectively-connecting the'base'of said one transistor to the collector of the said *other transistor through the second capacitor and secondvariable resistor of the second and third units; said last named means including a first switch having four contacts associated with. said second unit, one side of two of said contacts beingconnected to the collector of one of said units and the base of the other of said transistors, one side of the other two of said contacts being connected to the collector of said other transistor and the base of' the said other of said transistors, a second switch having four contacts associated with said third unit, theother side of the first said two of said contacts in the first position of said first switch being connected to one side of two of said contacts of said second switch and in their second position being connected to the first capacitor and firstvariable resistor of the second unit, the other side of the said other two contacts of said first switch in their first position" being connected to one side of the other two contacts of said second switch and in their second position being connected to the second capacitor and second variable resistor of the second unit, the-other side of the first said two of said contacts of the second switch in their first position being connected to the first capacitor and first variable'resistor of the third unit, the other side of the said other two contacts of the second switch in their first position being connected to the second capacitor and second variable resist-or of the third unit, an output signal being obtained from said first and second units when the contacts of said first switch are in their second position, and an output signal being obtained from said first and third units when the contacts of said first and second switches are in their first positions.

2. A variable frequency generator according to claim 1 including a variable resistor in series with each of said first and second variable resistors, and means for varying the effective values of the last named variable resistors in the second unit so that the effective values thereof are References Cited by the Examiner UNITED STATES PATENTS 2,547,523 4/1951 Eicher 331-144 2,619,534 11/1952 Payne 331 137 OTHER REFERENCES E. F. Doronkin: Electronic Express, Self-Excitation Modes in a Symmetrical Transistor Multivibrator, pages- ROY LAKE, Primary Examiner.

J. KOMINSKI, Assistant Exdminer.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO. 3,286,197 November 15, 1966 Vincent S. Borsattino et a1.

It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

In the heading to the printed specification, lines 3 to 5, for "Vincent 5. Borsattino, 4627 Lincoln St. Chursel E. Marker, 793 Indiana St. Jesse W. Shalla, 2424 W. 57th Place,

all of Gary, Ind." read Vincent S. Borsattino, Chursel E. Marker, and Jesse W. Shalla, all of Gary, Ind. assignors to United States Steel Corporation, a corporation of Delaware Signed and sealed this 12th day of September 1967.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Attcsting Officer Commissioner of Patents 

1. A MULTIPLE BAND VARIABLE FREQUENCY OSCILLATOR COMPRISING A FIRST UNIT INCLUDING A PAIR OF LIKE TRANSISTORS EACH HAVING A BASE, A COLLECTOR AND AN EMITTER, A D.C. POWER SOURCE, MEANS CONNECTING ONE SIDE OF SAID POWER SOURCE TO EACH OF SAID EMITTERS, A CONNECTION BETWEEN THE OTHER SIDE OF SAID POWER SOURCE AND ONE OF SAID COLLECTORS, A RESISTOR IN SAID CONNECTION, A CONNECTION BETWEEN THE SAID OTHER SIDE OF SAID POWER SOURCE AND THE OTHER OF SAID COLLECTORS, A RESISTOR IN SAID LAST NAMED CONNECTION, A CONNECTION BETWEEN THE SAID ONE SIDE OF SAID POWER SOURCE AND ONE OF SAID BASES, A RESISTOR IN SAID LAST NAMED CONNECTION, A CONNECTION BETWEEN THE SAID ONE SIDE OF SAID POWER SOURCE AND THE OTHER OF SAID BASES, AND A RESISTOR IN SAID LAST NAMED CONNECTION; A SECOND UNIT; A THIRD UNIT; EACH OF SAID SECOND AND THIRD UNITS HAVING A FIRST CAPACITOR CONNECTED IN PARALLEL WITH A FIRST VARIABLE RESISTOR, A SECOND CAPACITOR CONNECTED IN PARALLEL WITH A SECOND VARIABLE RESISTOR, THE VALUES OF THE FIRST AND SECOND CAPACITORS BEING EQUAL TO ONE ANOTHER, AND MEANS FOR VARYING THE EFFECTIVE VALUE OF THE FIRST AND SECOND VARIABLE RESISTORS SO THAT THE EFFECTIVE VALUE OF THE FIRST VARIABLE RESISTOR WILL BE THE SAME AS THE EFFECTIVE VALUE OF THE SECOND VARIABLE RESISTOR, THE VALUES OF THE VARIABLE RESISTORS AND CAPACITORS OF THE SECOND UNIT DIFFERING SUBSTANTIALLY FROM THE VALUES OF THE VARIABLE RESISTORS AND CAPACITORS OF THE THIRD UNIT; AND MEANS FOR SELECTIVELY CONNECTING THE COLLECTOR OF ONE OF SAID TRANSISTORS TO THE BASE OF THE OTHER TRANSISTOR THROUGH THE FIRST CAPACITOR AND FIRST VARIABLE RESISTOR OF THE SECOND AND THIRD UNITS AND SELECTIVELY CONNECTING THE BASE OF SAID ONE TRANSISTOR TO THE COLLECTOR OF THE SAID OTHER TRANSISTOR THROUGH THE SECOND CAPACITOR AND SECOND VARIABLE RESISTOR OF THE SECOND AND THIRD UNITS; SAID LAST NAMED MEANS INCLUDING A FIRST SWITCH HAVING FOUR CONTACTS ASSOCIATED WITH SAID SECOND UNIT, ONE SIDE OF TWO OF SAID CONTACTS BEING CONNECTED TO THE COLLECTOR OF ONE OF SAID UNITS AND THE BASE OF THE OTHER OF SAID TRANSISTORS, ONE SIDE OF THE OTHER TWO OF SAID CONTACTS BEING CONNECTED TO THE COLLECTOR OF SAID OTHER TRANSISTOR AND THE BASE OF SAID OTHER OF SAID TRANSISTORS, A SECOND SWITCH HAVING FOUR CONTACTS ASSOCIATED WITH SAID THIRD UNIT, THE OTHER SIDE OF THE FIRST SAID TWO OF SAID CONTACTS IN THE FIRST POSITION OF SAID FIRST SWITCH BEING CONNECTED TO ONE SIDE OF TWO OF SAID CONTACTS OF SAID SECOND SWITCH AND IN THEIR SECOND POSITION BEING CONNECTED TO THE FIRST CAPACITOR AND FIRST VARIABLE RESISTOR OF THE SECOND UNIT, THE OTHER SIDE OF THE SAID OTHER TWO CONTACTS OF SAID FIRST SWITCH IN THEIR FIRST POSITION BEING CONNECTED TO ONE SIDE OF THE OTHER TWO CONTACTS OF SAID SECOND SWITCH AND IN THEIR SECOND POSITION BEING CONNECTED TO THE SECOND CAPACITOR AND SECOND VARIABLE RESISTOR OF THE SECOND UNIT, THE OTHER SIDE OF THE FIRST SAID TWO OF SAID CONTACTS OF THE SECOND SWITCH IN THEIR FIRST POSITION BEING CONNECTED TO THE FIRST CAPACITOR AND FIRST VARIABLE RESISTOR OF THE THIRD UNIT, THE OTHER SIDE OF THE SAID OTHER TWO CONTACTS OF THE SECOND SWITCH IN THEIR FIRST POSITION BEING CONNECTED TO THE SECOND CAPACITOR AND SECOND VARIABLE RESISTOR OF THE THIRD UNIT, AN OUTPUT SIGNAL BEING OBTAINED FROM SAID FIRST AND SECOND UNITS WHEN THE CONTACTS OF SAID FIRST SWITCH ARE IN THEIR SECOND POSITION, AND AN OUTPUT SIGNAL BEING OBTAINED FROM SAID FIRST AND THIRD UNITS WHEN THE CONTACTS OF SAID FIRST AND SECOND SWITCHES ARE IN THEIR FIRST POSITIONS. 